Question about 2004 Dodge Ram 1500

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Engine stalls after it has been raining heavy. p0508 code then next day it runs fine

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  • J.c. Kirkwood
    J.c. Kirkwood Jan 24, 2013

    Ended up being a wire that rubbed bare in the wire harness under a brace near the fire wall..Tough to find..

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  • Master
  • 1,986 Answers

P0508 Idle Air Control Circuit Low.
This means that the Idle Air Control Circuit input is below acceptable limits.
You need to test the Idle Air Control (IAC) valve, the wiring between the IAC and the PCM and made sure the IAC passages in the throttle body are clean.

Your PCM unit may actually be faulty and letting moisture in

Posted on Sep 08, 2009

  • J.c. Kirkwood
    J.c. Kirkwood Jan 24, 2013

    We replaced the pcm unit...but it turned out to be a barered wire in the wiring harness.. But thanks!

  • Brandon Bray Jul 04, 2017

    How did you find the wire? Mine does the same thing. I spray water on the passenger side of the motor and the truck cuts off immediately. I have replaced almost everything!!

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